Environmental dissimilarity over time in a large subtropical shallow lake is differently represented by phytoplankton functional approaches
Juliana E. Bohnenberger A C , Lúcia R. Rodrigues A , David da Motta-Marques A and Luciane O. Crossetti B
+ Author Affiliations
- Author Affiliations
A Universidade Federal do Rio Grande do Sul, Instituto de Pesquisas Hidráulicas, Avenida Bento Gonçalves, 9500, Porto Alegre, 91501-970, RS, Brazil.
B Universidade Federal do Rio Grande do Sul, Departamento de Ecologia, Instituto de Biociências, Avenida Bento Gonçalves, 9500, Porto Alegre, 91501-970, RS, Brazil.
C Corresponding author. Email bonhju@yahoo.com.br
Marine and Freshwater Research 69(1) 95-104 https://doi.org/10.1071/MF16417
Submitted: 17 December 2016 Accepted: 18 July 2017 Published: 22 August 2017
Abstract
The aim of the present study was to understand how different phytoplankton functional approaches responded to environmental variability in a large shallow lake, namely Lake Mangueira, in southern Brazil. This coastal lake has a maximum depth of 7 m and is ~90 km long and ~3–10 km wide. Physical and chemical variables, maximum linear dimension, life forms, functional and morphofunctional groups of phytoplankton were analysed. The results showed that the phytoplankton were primarily comprised Cyanobacteria (63.9%), followed by middle-sized algae (21–50 μm; 46.7%) and colonial non-flagellated taxa (63%). The highest percentage of total biomass was accounted for by the functional group ‘K’ (as classified by Reynolds et al. 2002; 36.3%), large mucilaginous colonies (46.79%) according to morphologically based functional classification and other large colonies (mostly non-vacuolated; 36.7%) according to morphofunctional classification. Dissimilarity analysis indicated a significant correlation between abiotic data and functional approaches (P = 0.001). The dissimilarity in the functional compositions of phytoplankton was related to nutrient and light conditions, especially to silicon content and water transparency, in all functional approaches. The highest correlation with abiotic variables was seen for morphologically based functional group community structure, although the functional group composition of phytoplankton sensu Reynolds et al. seemed to be the most effective system in describing environmental variability in Lake Mangueira over the long term.
Additional keywords: functional groups, life forms, maximum linear dimension, morphology.
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